E2/AS1, 4th edition

E2 External Moisture Acceptable Solution E2/AS1 Fourth Edition provides a compliance pathway for meeting the weathertightness performance requirements of Clause E2 of the New Zealand Building Code for buildings up to 10 metres in height. It applies to buildings within the scope of NZS 3604 and covers a wide range of cladding systems, including masonry veneer, stucco, timber weatherboards, fibre cement, profiled metal, plywood, and EIFS. The document includes a risk matrix to assess weathertightness risk and determine appropriate cladding solutions. It includes detailed requirements for materials, flashings, roof and wall junctions, decks, parapets, roof cladding, wall cladding, and construction moisture. The fourth edition features a revised layout, updated references, and integration with the Building Product Specifications for windows, fixings, and membranes.